From 7e1b06ecf9b732816b098cfef5d1882b6c8c04b4 Mon Sep 17 00:00:00 2001
From: Indrajit Raychaudhuri <irc@indrajit.com>
Date: Mon, 19 Jun 2017 20:23:00 -0500
Subject: [PATCH] Tighten regex rule to discard IP address as hostname

---
 updateHostsFile.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/updateHostsFile.py b/updateHostsFile.py
index 4de7f3eb0..59c9b6d61 100644
--- a/updateHostsFile.py
+++ b/updateHostsFile.py
@@ -501,7 +501,8 @@ def normalize_rule(rule):
         The rule string with spelling and spacing reformatted.
     """
 
-    result = re.search(r'^[ \t]*(\d+\.\d+\.\d+\.\d+)\s+([\w\.-]+)(.*)', rule)
+    result = re.search(r'^\s*(\d{1,3}\.){3}\d{1,3}\s+([\w\.-]+[a-zA-Z])(.*)',
+                       rule)
     if result:
         hostname, suffix = result.group(2, 3)